diff --git a/Cargo.toml b/Cargo.toml
index d0e95870f145..9da586a7d6cc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ exclude = [
 ]
 
 [workspace.package]
-version = "0.34.1"
+version = "0.34.2"
 authors = ["Ritchie Vink <ritchie46@gmail.com>"]
 edition = "2021"
 homepage = "https://www.pola.rs/"
@@ -64,21 +64,21 @@ ryu = "1.0.13"
 lexical-core = "0.8.5"
 percent-encoding = "2.3"
 xxhash-rust = { version = "0.8.6", features = ["xxh3"] }
-polars-core = { version = "0.34.1", path = "crates/polars-core", default-features = false }
-polars-plan = { version = "0.34.1", path = "crates/polars-plan", default-features = false }
-polars-lazy = { version = "0.34.1", path = "crates/polars-lazy", default-features = false }
-polars-pipe = { version = "0.34.1", path = "crates/polars-pipe", default-features = false }
-polars-row = { version = "0.34.1", path = "crates/polars-row", default-features = false }
-polars-ffi = { version = "0.34.1", path = "crates/polars-ffi", default-features = false }
-polars-ops = { version = "0.34.1", path = "crates/polars-ops", default-features = false }
-polars-sql = { version = "0.34.1", path = "crates/polars-sql", default-features = false }
-polars-algo = { version = "0.34.1", path = "crates/polars-algo", default-features = false }
-polars-time = { version = "0.34.1", path = "crates/polars-time", default-features = false }
-polars-utils = { version = "0.34.1", path = "crates/polars-utils", default-features = false }
-polars-io = { version = "0.34.1", path = "crates/polars-io", default-features = false }
-polars-error = { version = "0.34.1", path = "crates/polars-error", default-features = false }
-polars-json = { version = "0.34.1", path = "crates/polars-json", default-features = false }
-polars = { version = "0.34.1", path = "crates/polars", default-features = false }
+polars-core = { version = "0.34.2", path = "crates/polars-core", default-features = false }
+polars-plan = { version = "0.34.2", path = "crates/polars-plan", default-features = false }
+polars-lazy = { version = "0.34.2", path = "crates/polars-lazy", default-features = false }
+polars-pipe = { version = "0.34.2", path = "crates/polars-pipe", default-features = false }
+polars-row = { version = "0.34.2", path = "crates/polars-row", default-features = false }
+polars-ffi = { version = "0.34.2", path = "crates/polars-ffi", default-features = false }
+polars-ops = { version = "0.34.2", path = "crates/polars-ops", default-features = false }
+polars-sql = { version = "0.34.2", path = "crates/polars-sql", default-features = false }
+polars-algo = { version = "0.34.2", path = "crates/polars-algo", default-features = false }
+polars-time = { version = "0.34.2", path = "crates/polars-time", default-features = false }
+polars-utils = { version = "0.34.2", path = "crates/polars-utils", default-features = false }
+polars-io = { version = "0.34.2", path = "crates/polars-io", default-features = false }
+polars-error = { version = "0.34.2", path = "crates/polars-error", default-features = false }
+polars-json = { version = "0.34.2", path = "crates/polars-json", default-features = false }
+polars = { version = "0.34.2", path = "crates/polars", default-features = false }
 rand_distr = "0.4"
 reqwest = { version = "0.11", default-features = false }
 arrow-array = { version = ">=41", default-features = false }
@@ -90,7 +90,7 @@ avro-schema = { version = "0.3" }
 
 [workspace.dependencies.arrow]
 package = "polars-arrow"
-version = "0.34.1"
+version = "0.34.2"
 path = "crates/polars-arrow"
 default-features = false
 features = [
diff --git a/crates/polars-sql/Cargo.toml b/crates/polars-sql/Cargo.toml
index b03757ec4435..6a91e24dcd3b 100644
--- a/crates/polars-sql/Cargo.toml
+++ b/crates/polars-sql/Cargo.toml
@@ -29,3 +29,4 @@ ipc = ["polars-lazy/ipc"]
 parquet = ["polars-lazy/parquet"]
 semi_anti_join = ["polars-lazy/semi_anti_join"]
 diagonal_concat = ["polars-lazy/diagonal_concat"]
+nightly = []
diff --git a/crates/polars-sql/src/functions.rs b/crates/polars-sql/src/functions.rs
index 84f6987c3e0b..6222c57766b3 100644
--- a/crates/polars-sql/src/functions.rs
+++ b/crates/polars-sql/src/functions.rs
@@ -242,6 +242,7 @@ pub(crate) enum PolarsSqlFunctions {
     /// ```sql
     /// SELECT INITCAP(column_1) from df;
     /// ```
+    #[cfg(feature = "nightly")]
     InitCap,
     /// SQL 'left' function
     /// Returns the `length` first characters
@@ -579,6 +580,7 @@ impl PolarsSqlFunctions {
             // String functions
             // ----
             "ends_with" => Self::EndsWith,
+            #[cfg(feature = "nightly")]
             "initcap" => Self::InitCap,
             "length" => Self::Length,
             "left" => Self::Left,
@@ -697,6 +699,7 @@ impl SqlFunctionVisitor<'_> {
             // String functions
             // ----
             EndsWith => self.visit_binary(|e, s| e.str().ends_with(s)),
+            #[cfg(feature = "nightly")]
             InitCap => self.visit_unary(|e| e.str().to_titlecase()),
             Left => self.try_visit_binary(|e, length| {
                 Ok(e.str().slice(0, match length {
diff --git a/crates/polars/Cargo.toml b/crates/polars/Cargo.toml
index 62455cda2c5e..acb7e1a827a4 100644
--- a/crates/polars/Cargo.toml
+++ b/crates/polars/Cargo.toml
@@ -35,7 +35,7 @@ sql = ["polars-sql"]
 rows = ["polars-core/rows"]
 simd = ["polars-core/simd", "polars-io/simd", "polars-ops/simd"]
 avx512 = ["polars-core/avx512"]
-nightly = ["polars-core/nightly", "polars-ops/nightly", "simd", "polars-lazy?/nightly"]
+nightly = ["polars-core/nightly", "polars-ops/nightly", "simd", "polars-lazy?/nightly", "polars-sql/nightly"]
 docs = ["polars-core/docs"]
 temporal = ["polars-core/temporal", "polars-lazy?/temporal", "polars-io/temporal", "polars-time"]
 random = ["polars-core/random", "polars-lazy?/random", "polars-ops/random"]
diff --git a/py-polars/Cargo.lock b/py-polars/Cargo.lock
index 92d5ab8a62db..5514892a096d 100644
--- a/py-polars/Cargo.lock
+++ b/py-polars/Cargo.lock
@@ -1576,7 +1576,7 @@ dependencies = [
 
 [[package]]
 name = "polars"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "getrandom",
  "polars-core",
@@ -1590,7 +1590,7 @@ dependencies = [
 
 [[package]]
 name = "polars-algo"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "polars-core",
  "polars-lazy",
@@ -1599,7 +1599,7 @@ dependencies = [
 
 [[package]]
 name = "polars-arrow"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "arrow-format",
@@ -1633,7 +1633,7 @@ dependencies = [
 
 [[package]]
 name = "polars-core"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "bitflags 2.4.0",
@@ -1666,7 +1666,7 @@ dependencies = [
 
 [[package]]
 name = "polars-error"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "arrow-format",
  "avro-schema",
@@ -1679,7 +1679,7 @@ dependencies = [
 
 [[package]]
 name = "polars-ffi"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "polars-arrow",
  "polars-core",
@@ -1687,7 +1687,7 @@ dependencies = [
 
 [[package]]
 name = "polars-io"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "async-trait",
@@ -1729,7 +1729,7 @@ dependencies = [
 
 [[package]]
 name = "polars-json"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "chrono",
@@ -1748,7 +1748,7 @@ dependencies = [
 
 [[package]]
 name = "polars-lazy"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "bitflags 2.4.0",
@@ -1773,7 +1773,7 @@ dependencies = [
 
 [[package]]
 name = "polars-ops"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "argminmax",
@@ -1805,7 +1805,7 @@ dependencies = [
 
 [[package]]
 name = "polars-pipe"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "crossbeam-channel",
  "crossbeam-queue",
@@ -1827,7 +1827,7 @@ dependencies = [
 
 [[package]]
 name = "polars-plan"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "bytemuck",
@@ -1855,7 +1855,7 @@ dependencies = [
 
 [[package]]
 name = "polars-row"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "polars-arrow",
  "polars-error",
@@ -1864,7 +1864,7 @@ dependencies = [
 
 [[package]]
 name = "polars-sql"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "polars-arrow",
  "polars-core",
@@ -1879,7 +1879,7 @@ dependencies = [
 
 [[package]]
 name = "polars-time"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "atoi",
  "chrono",
@@ -1898,7 +1898,7 @@ dependencies = [
 
 [[package]]
 name = "polars-utils"
-version = "0.34.1"
+version = "0.34.2"
 dependencies = [
  "ahash",
  "bytemuck",